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AH8500

LOW POWER/MICROPOWER LINEAR HALL EFFECT SENSOR


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AH8500 pdf
AH8500
LOW POWER/MICROPOWER
LINEAR HALL EFFECT SENSOR
Description
Pin Assignments
The AH8500 is a low power/micropower linear Hall effect sensor with
an 8-bit output resolution. The output voltage is ratiometric to the
supply voltage and proportional to the magnetic flux density
perpendicular to the part marking surface. The output null voltage is
at half the supply voltage.
AH8500 has a typical sensitivity of 2.1mV/G and 3.55mV/G at 1.8V
and 3V. The typical null voltage offset is less than 1% of VDD. The
device has a typical input referred rms noise of 0.36G and 0.24G at
1.8V and 3.0V.
Designed for battery powered consumer equipment to office
equipment, home appliances and industrial applications, the AH8500
can operate over the supply range of 1.6V to 3.6V and uses an
externally controlled ENABLE pin clocking system to control operating
modes and sampling rates and to minimize the power consumption.
The typical average operating supply current is between 8.9µA during
“Sleep” mode and 1.16mA at maximum sampling rate 1.8V. With a
conversion pulse every 50ms at the ENABLE pin, the device achieves
a micropower operation with the power consumption of 22µW typical
at 1.8V supply.
To minimize PCB space the AH8500 is available in small low profile
U-DFN2020-6.
Features
Linear Hall Effect Sensor with +/-430G Sense Range and
Output Voltage with 8-bit resolution
Supply Voltage of 1.6V to 3.6V
Sensitivity: 2.1mV/G and 3.55mV/G at 1.8V and 3V at +25oC
Low Offset Voltage
Low Average Supply Current
8.9µA Typical in Sleep Mode (Default) at 1.8V
1.01mA Typical in Auto-Run Mode ( 6.25kHz) at 1.8V
12µA Typical in External Drive Mode with 20Hz Sample
Rate at 1.8V
1.16mA Typical in External Drive Mode with 7.14kHz
Sample Rate at 1.8V
Chopper Stabilized Design with Superior Temperature Stability,
Minimal Sensitivity Drift, Enhanced Immunity to Physical Stress
Output Voltage Maintained at „Sleep‟ Mode
-40°C to +85°C Operating Temperature
High ESD Capability of 6kV Human Body Model
Small Low Profile U-DFN2020-6 Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
(Top View)
OUTPUT 1
6 NC
NC 2
5 GND
VDD 3
Exposed
Pad
4 ENABLE
U-DFN2020-6
Applications
High Accuracy Level, Proximity, Position and Travel Detection
Button Press Detection in Digital Still, Video Cameras and
Handheld Gaming Consoles
Accurate Door, Lids and Tray Position Detection
Liquid Level Detection
Joy Stick Control Gaming and Industrial Applications
Contact-Less Level, Proximity and Position Measurement in
Home Appliances and Industrial Applications
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated‟s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AH8500
Document number: DS37511 Rev. 1 - 2
1 of 19
www.diodes.com
February 2015
© Diodes Incorporated



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AH8500 pdf
Typical Applications Circuit
CIN
VDD
AH8500
ENABLE
OUTPUT
GND
AH8500
Note:
4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical and should be placed as close to
the supply pin as possible.
Pin Descriptions
Package: U-DFN2020-6
Pin Number
1
2
3
Pin Name
OUTPUT
NC
VDD
Function
Output Pin
No Connection (Note 5)
Power Supply Input
Device “Awake” and “Sleep” control pin:
An external PWM signal to the ENABLE pin controls the operating modes
(Sleep Mode, Auto-Run Mode and External Drive Mode), awake and sleep
periods to adjust the sampling rate and to minimize the power consumption
to achieve micropower operation.
When the ENABLE = GND continuously the device is in sleep mode
consuming only 8.9µA typical at 1.8V. When the ENABLE pin is left floating,
the device defaults to sleep mode. The ENABLE pin is internally pulled low.
4 ENABLE
When ENABLE = VDD (or Logic High) continuously, device is in auto-run
mode with sampling rate of 6.25kHz typical consuming 1.01mA at 1.8V.
In external drive mode, an external PWM signal can be used to drive the
ENABLE pin to adjust the sampling frequency up to 7.14kHz typical.
A minimum pulse width needed on ENABLE pin to start one Awake/Sleep
cycle (i.e. one sample/conversion cycle) is 20µs typical. We recommend
using a pulse width of 40µs minimum. The minimum awake period for one
sample/conversion cycle is140µs typical.
5
GND
Ground Pin
6 NC No Connection (Note 5)
The center exposed pad No connection internally.
Pad Pad The exposed pad can be left open (unconnected) or tied to the GND on the
PCB layout.
Note:
5. NC is “No Connection” pin and is not connected internally. This pin can be left open or tied to ground.
AH8500
Document number: DS37511 Rev. 1 - 2
2 of 19
www.diodes.com
February 2015
© Diodes Incorporated



Part Number AH8500
Description LOW POWER/MICROPOWER LINEAR HALL EFFECT SENSOR
Maker Diodes - Diodes
Total Page 19 Pages
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